21211002221101 has 36 divisors (see below), whose sum is σ = 27324863346816. Its totient is φ = 16281364453200.

The previous prime is 21211002221083. The next prime is 21211002221159. The reversal of 21211002221101 is 10112220011212.

It is not a de Polignac number, because 21211002221101 - 2⁷ = 21211002220973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211002221161) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1963645 + ... + 6802786.

It is an arithmetic number, because the mean of its divisors is an integer number (759023981856).

Almost surely, 2^{21211002221101} is an apocalyptic number.

It is an amenable number.

21211002221101 is a deficient number, since it is larger than the sum of its proper divisors (6113861125715).

21211002221101 is an equidigital number, since it uses as much as digits as its factorization.

21211002221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8766590 (or 8766516 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21211002221101 its reverse (10112220011212), we get a palindrome (31323222232313).

The spelling of 21211002221101 in words is "twenty-one trillion, two hundred eleven billion, two million, two hundred twenty-one thousand, one hundred one".